JP5086882B2 - Air conditioning duct fixing structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle air-conditioning duct fixing structure for fixing an air-conditioning duct connected to a blowout opening opened in a unit case of an air-conditioning unit.

Conventionally, when connecting a differential duct and a center vent duct, the number of parts is reduced and the assembly process is simplified to improve workability. A coupling part structure of an automobile air conditioning duct is known in which a claw part provided on the other side is inserted into a fitting hole provided on one side of the vent duct (see, for example, Patent Document 1).
JP-A-6-106956

  However, the conventional coupling structure of an air conditioning duct for automobiles is a coupling structure in which the fitting hole and the claw part are inserted, so that the relative position of the fitting hole and the claw part is different from the optimum insertion position in the design. If it deviates, the claw portion does not engage well with the fitting hole, and there is a problem that a low-pitched sound such as a rattling sound due to a rattling gap occurs when the vehicle receives vibration.

  That is, in the case of a vehicle air conditioner, a heater assembly (unit case), a differential duct, a center vent duct, and the like are resin molded parts, which are molded for each part and assembled by appropriately combining each part in a production line. Therefore, it is inevitable that dimensional variations occur between the resin molded parts during molding and assembly, and as a result, the relative positions of the fitting hole and the claw portion will deviate from the optimum insertion positions in the design during assembly. .

  The present invention has been made paying attention to the above-mentioned problem, and without generating an increase in the number of parts, the ducts are elastically fixed to each other while absorbing the dimensional variation, thereby generating low-pitched sound when subjected to vehicle vibration. It is an object to provide a vehicle air-conditioning duct fixing structure that can be prevented.

In order to achieve the above object, in the present invention, a first air outlet and a second air outlet that are opened in a unit case of an air conditioning unit, a first duct that is connected to the first air outlet and has an insertion-side rib, A second duct connected to the second outlet and having a receiving rib,
In the vehicle air-conditioning duct fixing structure in which the first duct is fixed to the second duct by inserting the insertion-side rib into the receiving-side rib,
The insertion-side rib is inserted into the receiving-side rib with elastic deformation so that a restoring elastic force acting in a direction of expanding the opposing surface of the receiving-side rib is a fixing force for fixing the first duct. plug-side elastic ribs der that is,
The insertion-side elastic rib has a stepped shape formed by a square-shaped protruding piece protruding from the first duct, and a pressing surface of a rib-side pressing portion that presses against an inner surface of the receiving-side rib, and the receiving-side rib A pressing surface of a duct-side pressing portion that presses against a wall surface of the second duct facing to each other, and an elastic bending portion formed at a connection portion between the rib-side pressing portion and the duct-side pressing portion,
The receiving-side rib has an inner surface that is in pressure contact with a pressing surface of a rib-side pressing portion of the insertion-side elastic rib, and a reinforcing rib portion that protrudes from the outer surface of the rib, and the insertion is performed by the reinforcing rib portion. even if insertion side elastic rib deformation amount is suppressed, the inner surface of the receiving-side rib is characterized that you have been set to the wall and parallel to surface of the second duct.

Therefore, in the vehicle air-conditioning duct fixing structure of the present invention, when the first duct is fixed to the second duct, the insertion-side elastic rib is inserted into the receiving-side rib. Accompanies elastic deformation of ribs. And after insertion, the restoring elastic force of the insertion side elastic rib which acts in the direction which expands the opposing surface of a receiving side rib is made into the fixing force which fixes a 1st duct.
Therefore, due to the elastic deformation of the insertion-side elastic rib, it is possible to absorb the dimensional variation between the respective duct components that occurs when the first duct and the second duct are molded or assembled. Since the restoring elastic force is a fixing force with respect to the first duct, even if there is vibration input in the air conditioning system, as long as the inputted vibration force does not exceed the restoring elastic force, the first duct and the second duct An elastic fixed state is maintained, and generation of lower sounds such as rattling sounds can be prevented.
As a result, the ducts are elastically fixed while absorbing the dimensional variation without increasing the number of parts, thereby preventing the generation of lower sounds when subjected to vehicle vibration.

  Hereinafter, the best mode for realizing a vehicle air-conditioning duct fixing structure of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall perspective view showing an internal layout of an instrument panel to which the vehicle air conditioning duct fixing structure of the first embodiment is applied. 2 is a view in the direction of the arrow C in FIG. 1 showing a fixing structure of both side differential ducts with respect to a center differential duct in the vehicle air conditioning duct fixing structure of the first embodiment.

  As shown in FIG. 1, the vehicle air-conditioning duct fixing structure of the first embodiment has an instrument panel 1, an air-conditioning unit 2, a unit case 3, and a left side differential duct 4 (corresponding to a first duct and a left side duct). ), Right side differential duct 5 (corresponding to the first duct and right side duct), center differential duct 6 (corresponding to the second duct and center duct), left insertion side elastic rib 7 (insertion side elastic rib) ), A right insertion side elastic rib 8 (insertion side elastic rib), a left receiving side rib 9 (receiving side rib), and a right receiving side rib 10 (receiving side rib).

  The instrument panel 1 is a panel that covers a front portion of a passenger compartment and is provided with various display instruments, an operation panel, and the like. Inside the instrument panel 1, as shown in FIG. 1, an air conditioning unit 2 that exhibits a heating / cooling function for keeping the temperature in the vehicle interior at an optimum temperature and a function for purifying the air in the vehicle interior is arranged.

  As shown in FIG. 1, the air conditioning unit 2 includes a unit case 3 containing an evaporator, a heater core, and the like, a left side differential duct 4 extending leftward from a setting position of the unit case 3, and a setting of the unit case 3 A right side differential duct 5 extending rightward from the position, and a center differential duct 6 extending from the set position of the unit case 3 in the vehicle front-rear direction.

  As shown in FIG. 1, the unit case 3 includes a center vent outlet 31, a left side vent outlet 32, a right side vent outlet 33, a left foot outlet 34, and a right foot outlet 35. A left side differential outlet 36, a right side differential outlet 37, and a center differential outlet 38 are provided. The unit case 3 is a resin molded product having a divided structure.

  The left side differential duct 4 is connected to a left side differential outlet 36 opened in the instrument panel 1, extends leftward from the position of the left side differential outlet 36, and extends rearward when reaching the end position. The left side differential duct 4 is a resin molded product. When the differential mode or the like is selected, the left side differential duct 4 blows conditioned air to remove glass fog on the inner surface of the left side glass of the front seat.

  The right side differential duct 5 is connected to a right side differential outlet 37 opened in the instrument panel 1, extends rightward from the position of the right side differential outlet 37, and extends rearward when reaching the end position. The right side differential duct 5 is a resin molded product. When the differential mode or the like is selected, the right side differential duct 5 blows conditioned air to remove glass fog on the inner surface of the right side glass of the front seat.

  The center differential duct 6 is connected to a center differential outlet 38 opened in the instrument panel 1, extends from the position of the center differential outlet 38 toward the front of the vehicle, and extends upward when reaching the end position. The center differential duct 6 is a resin molded product. When the differential mode or the like is selected, the center differential duct 6 blows conditioned air to remove glass fog on the inner surface of the windshield.

  As shown in FIGS. 1 and 2, the left insertion-side elastic rib 7 is integrally formed with a resin at the outer peripheral position of the unit case connection portion of the left side differential duct 4. The left insertion side elastic rib 7 is formed to extend in the vehicle width direction toward the right side differential duct 5.

  As shown in FIGS. 1 and 2, the right insertion side elastic rib 8 is integrally molded with a resin at an outer peripheral position of a unit case connection portion of the right side differential duct 5. The right insertion side elastic rib 8 is formed to extend in the vehicle width direction toward the left side differential duct 4.

  As shown in FIGS. 1 and 2, the left receiving side rib 9 and the right receiving side rib 10 are integrally molded with resin at the outer peripheral position of the unit case connecting portion of the center differential duct 6. That is, as shown in FIG. 2, the left and right receiving side ribs 9 and 10 correspond to the set positions of the left and right insertion side elastic ribs 7 and 8 that are opposed to each other, and the upper position of the wall surface 6a of the center differential duct 6 A pair is arranged.

  In the first embodiment, the left side differential duct 4 and the center differential duct 6 are fixed by inserting the left insertion side elastic rib 7 into the left reception side rib 9 with elastic deformation. The restoring elastic force acting in the direction of expanding the opposing surface is used as the fixing force. Similarly, the right side differential duct 5 and the center differential duct 6 are fixed by inserting the right insertion side elastic rib 8 into the right reception side rib 10 with elastic deformation, thereby pushing the opposing surface of the right reception side rib 10. The restoring elastic force acting in the expanding direction is used as the fixing force.

  3A and 3B show the left insertion side elastic rib and the left receiving side rib in the vehicle air conditioning duct fixing structure of the first embodiment. FIG. 3A is a plan view of the left insertion side elastic rib, and FIG. The C direction arrow view of FIG. 1 of an insertion side elastic rib is shown, (c) shows the C direction arrow view of FIG. 1 of a left receiving side rib. FIG. 4 shows the right insertion side elastic rib and the right receiving side rib in the vehicle air conditioning duct fixing structure of the first embodiment, and (a) shows a view of the right insertion side elastic rib in the direction of the arrow C in FIG. , (B) shows a C-direction arrow view of FIG. 1 of the right receiving side rib.

  As shown in FIGS. 3A and 3B, the left insertion-side elastic rib 7 has a stepped shape of one step formed by a square-shaped protruding piece protruding from the left side differential duct 4. The left insertion side elastic rib 7 protrudes from the left side differential duct 4 and has a rib side pressing portion 71 that presses against the inner surface 9 a of the left receiving side rib 9 and a center differential duct 6 that faces the left receiving side rib 9. A duct-side pressing portion 72 that presses against the wall surface 6a, and a rib-side pressing portion 71 and an elastic bending portion 73 formed at a connecting portion between the duct-side pressing portion 72.

  As shown in FIG. 3 (c), the left receiving rib 9 is provided with an inner surface 9a in pressure contact with the rib-side pressing portion 71 of the left insertion side elastic rib 7, and three ribs protruding from the rib outer surface in the vehicle front-rear direction. And a reinforcing rib portion 91. The left receiving side rib 9 is increased in strength by the reinforcing rib portion 91, so that the deformation amount can be minimized even when the left insertion side elastic rib 7 is inserted. Further, the inner surface 9 a of the left receiving rib 9 is set substantially parallel to the wall surface 6 a of the center differential duct 6.

  The gap between the pressing surface 71a of the rib-side pressing portion 71 and the pressing surface 72a of the duct-side pressing portion 72 before inserting the left insertion-side elastic rib 7 is defined as the insertion-side dimension a, and the inner surface 9a of the left receiving-side rib 9 The receiving side dimension b of the left insertion side elastic rib 7 is set to be larger than the receiving side dimension b of the left receiving side rib 9 where the distance between the wall 6a of the center differential duct 6 and the receiving side dimension b is set. Yes. The insertion-side dimension a of the left insertion-side elastic rib 7 and the receiving-side dimension b of the left receiving-side rib 9 are the maximum variations assumed when the left side differential duct 4 and the center differential duct 6 are manufactured or assembled. Even if there is, the dimension is set so that the insertion-side dimension a is larger than the receiving-side dimension b.

  For example, the insertion-side dimension a is a = 8.4 ± 0.3 mm, and the receiving-side dimension b (<a) is b = 6.8 mm. That is, the maximum variation range is set to ± 0.3 mm, and the dimensional difference (ab) is secured within the range of the minimum dimensional difference 1.3 mm to the maximum dimensional difference 1.9 mm even if there is a dimensional variation. Further, the angle θ formed by the rib-side pressing portion 71 and the elastic bending portion 73 is set to 140 °, for example, to obtain an appropriate restoring elastic force while ensuring durability reliability. Further, as shown in FIGS. 3A and 3B, the left insertion-side elastic rib 7 has a tapered guide portion 74 having a tapered shape that gradually decreases in thickness in the insertion direction.

  As shown in FIG. 4A, the right insertion side elastic rib 8 has a two-step shape formed by a square-shaped protruding piece protruding from the right side differential duct 5. A rib side pressing portion 81 pressed against the inner surface 10a, a duct side pressing portion 82 pressed against the wall surface 6a of the center differential duct 6 facing the right receiving side rib 10, the rib side pressing portion 81 and the duct side pressing portion 82. And an elastic bending portion 83 formed at the connection portion. The rib side pressing portion 81 is provided so as to protrude from the right side differential duct 5 via a laterally protruding portion 85 and an inclined portion 86.

  As shown in FIG. 4 (b), the right receiving side rib 10 is provided with an inner surface 10a in pressure contact with the rib side pressing portion 81 of the right insertion side elastic rib 8, and three ribs protruding from the rib outer surface in the vehicle front-rear direction. And a reinforcing rib portion 101. Note that the strength of the right receiving side rib 10 is increased by the reinforcing rib portion 101, so that the deformation amount can be minimized even if the right insertion side elastic rib 8 is inserted. Further, the inner surface 10 a of the right receiving side rib 10 is set substantially parallel to the wall surface 6 a of the center differential duct 6.

  The distance between the pressing surface 81a of the rib-side pressing portion 81 and the pressing surface 82a of the duct-side pressing portion 82 before inserting the right insertion-side elastic rib 8 is defined as the insertion-side dimension a, and the inner surface 10a of the right receiving-side rib 10 The receiving side dimension b of the right insertion side elastic rib 8 is set to be larger than the receiving side dimension b of the right receiving side rib 10 where the distance between the wall 6a of the center differential duct 6 and the receiving side dimension b is set. Yes. The insertion-side dimension a of the right insertion-side elastic rib 8 and the receiving-side dimension b of the right receiving-side rib 10 are the maximum variations assumed when the right side differential duct 5 and the center differential duct 6 are manufactured or assembled. Even if there is, the dimension is set so that the insertion-side dimension a is larger than the receiving-side dimension b.

  For example, the insertion-side dimension a is a = 8.4 ± 0.3 mm, and the receiving-side dimension b (<a) is b = 6.8 mm. That is, the maximum variation range is set to ± 0.3 mm, and the dimensional difference (ab) is secured within the range of the minimum dimensional difference 1.3 mm to the maximum dimensional difference 1.9 mm even if there is a dimensional variation. Further, the angle θ formed by the rib-side pressing portion 81 and the elastic bending portion 83 is set to 140 °, for example, to obtain an appropriate restoring elastic force while ensuring durability reliability. Further, as shown in FIG. 4A, the right insertion-side elastic rib 8 has a taper guide portion 84 having a tapered shape that gradually decreases in thickness in the insertion direction.

Next, the operation will be described.
First, the explanation will be given on “Dispersion Absorption Technology in the Duct Fixing Structure”, and then the operation in the vehicle air-conditioning duct fixing structure in Example 1 will be described as “Insert fixing using insertion side elastic ribs and receiving side ribs”. The operation will be divided into “operation” and “lower sound generation prevention operation during vibration input”.

[Dispersion absorption technology with duct fixing structure]
FIG. 5 is an operation explanatory perspective view showing an insertion fixing action by the insertion side rib and the receiving side rib in the conventional duct fixing structure. FIG. 6 is an operation explanatory view showing an insertion fixing state by the insertion side rib and the receiving side rib in the conventional duct fixing structure.

  2. Description of the Related Art A duct fixing structure that fixes a duct A to a duct B without inserting a screw or the like by inserting the insertion side rib into the receiving rib is known. In this duct fixing structure, when the ducts A and B are fixed without absorbing manufacturing variations and assembly variations, there is a backlash between the insertion side rib and the receiving side rib, and vibration input from the tire through the vehicle body As a result, lower sounds such as rattling and rubbing sounds are generated. When this low-level sound is generated in the instrument panel in which the ducts A and B are arranged, the instrument panel is transmitted to the vehicle interior as a diaphragm, and for example, this noise becomes annoying for passengers when the vehicle is stopped. It is necessary to prevent the generation of low tone.

  On the other hand, in the conventional duct fixing structure, as shown in FIG. 5, when the flat insertion-side rib of duct A is inserted into the receiving-side rib of duct B and fixed, urethane ( As shown in Fig. 6, a structure that presses the upper surface of the insertion rib on the duct A against the receiving rib on the duct B as shown in Fig. 6 is used. Is prevented from occurring.

  However, the ducts A and B have manufacturing variations and cannot be designed completely tight. Urethane reaction force is also affected by assembly variations, and is also affected by reaction force drop due to deterioration over time. Therefore, it may not be possible to prevent the generation of lower sound due to vibrations input from the tire through the vehicle body. In such a case, a cushion material such as a nonwoven fabric is wound around the insertion rib of the duct A. doing.

That is, since the conventional duct fixing structure is intended to absorb variations using urethane or a cushion material, it has the following problems to be solved.
(1) During duct fixing work, setting of urethane and wrapping of cushion material are required. For this reason, the work of fixing the ducts cannot be easily performed.
(2) It is necessary to use urethane or cushioning material to prevent the generation of low-pitched sound. For this reason, the number of parts increases, which is disadvantageous in terms of cost.
(3) Reducing the generation of low-pitched sound by relying on the resilience of urethane and other materials. For this reason, depending on the deterioration of the urethane over time, if the repulsive force of the urethane or the cushioning material is lowered due to long-term use, the generation of lower sounds is allowed thereafter.

[Insertion fixing action using insertion side elastic rib and receiving side rib]
FIG. 7 shows an insertion fixing action using the insertion-side elastic rib and the receiving-side rib in the vehicle air-conditioning duct fixing structure of the first embodiment, and (a) shows the insertion action of the insertion-side elastic rib to the receiving-side rib. An exploded perspective view is shown, and (b) shows a taper guide action at an E portion for ensuring insertion workability.

  For example, when the left side differential duct 4 is fixed to the center differential duct 6, the left insertion side elastic rib 7 of the left side differential duct 4 is directed toward the front side of the vehicle as shown by an arrow D in FIG. This is done by inserting into the left receiving side rib 9 of the center differential duct 6.

  At the time of insertion, the taper guide portion 74 abuts on the end surface 9b of the left receiving side rib 9, and shows a taper guide action that gradually guides the left insertion side elastic rib 7 to the inner surface 9a of the left receiving side rib 9 while bending downward. . For this reason, compared with the case where it inserts into the left receiving side rib 9 compulsorily, inclining the left insertion side elastic rib 7 with a dimensional difference, the ease of insertion is ensured.

  When the left insertion-side elastic rib 7 is pushed into the inner surface 9a of the left receiving-side rib 9, the left insertion-side elastic rib 7 has a dimensional difference (ab) between the insertion-side dimension a and the receiving-side dimension b. This is accompanied by elastic deformation. In this way, even if there is a maximum variation that is assumed when the right side differential duct 5 and the center differential duct 6 are manufactured or assembled, the insertion side dimension a of the right insertion side elastic rib 8 is equal to the right receiving side rib 10. Therefore, the left insertion-side elastic rib 7 is reliably elastically deformed while absorbing the dimensional variation between the duct parts.

  When the right side differential duct 5 is fixed to the center differential duct 6, the right insertion side elastic rib 8 of the right side differential duct 5 is inserted into the right receiving side rib 10 of the center differential duct 6 toward the vehicle front side. In this case as well, the right insertion side is securely inserted while absorbing the dimensional variation between the duct parts, as in the case of inserting the left insertion side elastic rib 7 into the left reception side rib 9. The effect | action which the elastic rib 8 elastically deforms is shown.

[Lower-frequency sound generation prevention effect when vibration is input]
FIG. 8 is an operation explanatory view showing an insertion fixing state using an elastic restoring force by the insertion side elastic rib and the receiving side rib in the vehicle air conditioning duct fixing structure of the first embodiment.

  In the vehicle air-conditioning duct fixing structure of Example 1, the left and right insertion side elastic ribs 7 and 8 having a stepped shape are adopted as the insertion side rib, and the insertion side dimension a is set larger than the receiving side dimension b. By using the restoring elastic forces F and F of the elastic bending portions 73 and 83, a tightening structure to the left and right receiving ribs 9 and 10 that are pressed and fixed to the upper side and the lower side is adopted.

  For this reason, when the left insertion-side elastic rib 7 is inserted into the left receiving-side rib 9, as shown in FIG. 8, the inner surface 9a of the left receiving-side rib 9 and the wall surface 6a of the center differential duct 6 opposed thereto, The restoring elastic forces F and F of the left insertion-side elastic rib 7 acting in the direction in which the left side differential rib 4 is expanded are used as a fixing force for fixing the left side differential duct 4. The positioning function of the left side differential duct 4 is achieved by fitting the left side differential outlet 36 opened in the unit case 3 with the left side differential duct 4.

  Similarly, when the right insertion side elastic rib 8 is inserted into the right receiving side rib 10, the restoring elastic forces F and F of the right insertion side elastic rib 8 are set as fixing forces for fixing the right side differential duct 5. The right side differential duct 5 is positioned and fixed to the right side differential outlet 37 opened in the unit case 3.

  Accordingly, since the restoring elastic forces F and F are fixed forces to the left side differential duct 4, as shown in FIG. 8, the vibration force f from the left side differential duct 4 side of the air conditioning system and the center differential duct 6 side Even if the vibration force f is input, as long as the input vibration forces f and f do not exceed the restoring elastic forces F and F, the elastic fixing of the left side differential duct 4 and the center differential duct 6 is maintained. Generation of low-pitched sounds such as beating sounds can be prevented.

  Similarly, for fixing the right side differential duct 5 and the center differential duct 6, as long as the input vibration forces f and f do not exceed the restoring elastic forces F and F, the right side differential duct 5 and the center differential duct 6 are fixed. Elastic fixation is maintained.

As a result, the vehicle air-conditioning duct fixing structure of Example 1 is
-Ducts can be fixed easily.
-Sound generation can be prevented without using cushioning materials (cost reduction).
-Since it does not rely on the resilience of urethane, etc., it is not affected by urethane aging.
-Costs can be reduced because there is no work such as screwing.
It also has the usefulness.

Next, the effect will be described.
In the vehicle air-conditioning duct fixing structure of the first embodiment, the effects listed below can be obtained.

  (1) A first air outlet (left side differential air outlet 36, right side differential air outlet 37) and a second air outlet (center differential air outlet 38) opened in the unit case 3 of the air conditioning unit 2, and the first air outlet A first duct (left side differential duct 4 and right side differential duct 5) connected and having a plug-in side rib, and a second duct (center differential duct 6) connected to the second outlet and having a receiving side rib And the first duct is fixed to the second duct by inserting the insertion-side rib into the receiving-side rib, wherein the insertion-side rib is the receiving-side rib. By inserting the ribs (the left receiving side rib 9 and the right receiving side rib 10) with elastic deformation, the restoring elastic force acting in the direction of expanding the opposing surface of the receiving side rib is applied to the first duct. These are insertion side elastic ribs (left insertion side elastic ribs 7, right insertion side elastic ribs 8) that serve as a fixing force for fixing the G. For this reason, it is possible to prevent the generation of low-level sounds when subjected to vehicle vibration by elastically fixing the ducts while absorbing dimensional variations without increasing the number of parts.

  (2) The insertion-side elastic ribs 7, 8 are rib-side pressing portions 71, 81 that press against the inner surfaces 9 a, 10 a of the receiving-side ribs 9, 10, and a second that faces the receiving-side ribs 9, 10. Duct side pressing portions 72 and 82 that press against the wall surface 6a of the duct (center differential duct 6), and an elastic bending portion 73 formed at a connecting portion between the rib side pressing portions 71 and 81 and the duct side pressing portions 72 and 82. 83, and before inserting the insertion-side elastic ribs 7, 8, the pressing surfaces 71a, 81a of the rib-side pressing portions 71, 81 and the pressing surfaces 72a, 82a of the duct-side pressing portions 72, 82 are inserted. Is the insertion-side dimension a, and the insertion-side dimension a is the reception-side dimension b, the separation between the inner surfaces 9a, 10a of the receiving-side ribs 9, 10 and the wall surface 6a of the second duct (center differential duct 6). The insertion side dimension a of the side elastic ribs 7 and 8 is The receiving side ribs 9 and 10 were set to dimensions larger than the receiving side dimension b. Therefore, the insertion-side elastic ribs 7 and 8 are formed in a stepped shape, and the restoring elastic force of the elastic deflecting portions 73 and 83 is used to make the inner surfaces 9a and 10a of the receiving-side ribs 9 and 10 and the wall surface 6a of the second duct. The first duct can be elastically fixed to the second duct by the tightening structure pressed against the second duct.

  (3) The insertion-side dimension a of the insertion-side elastic ribs 7 and 8 and the receiving-side dimension b of the receiving-side ribs 9 and 10 are assumed when the first duct and the second duct are manufactured or assembled. The insertion side dimension a is set to be larger than the receiving side dimension b even when there is a maximum variation. For this reason, even if the first duct and the second duct vary during manufacturing or assembly, the change in dimensional difference due to the variation is reliably absorbed, and the first duct is elastically fixed to the second duct by the restoring elastic force. be able to.

  (4) The insertion-side elastic ribs 7 and 8 have taper guide portions 74 and 84 having a tapered shape that gradually decreases in thickness in the insertion direction. For this reason, the taper guide action that gradually guides the left insertion-side elastic rib 7 to the inner surface 9a of the left receiving-side rib 9 can ensure the ease of insertion.

  (5) The first duct includes a left side duct (left side differential duct 4) extending leftward from the set position of the unit case 3 and a right side duct (right side differential extending rightward from the set position of the unit case 3). The insertion side elastic ribs 7 and 8 are the left insertion side elastic ribs 7 integrally molded with the outer peripheral position of the unit case connecting portion of the left side duct, and the right side duct. A right insertion-side elastic rib 8 integrally molded with resin at the outer peripheral position of the unit case connection portion, and the second duct extends from the set position of the unit case 3 in the vehicle longitudinal direction (center differential duct 6). The receiving-side ribs are a left receiving-side rib 9 and a right receiving-side rib 10 that are integrally resin-molded at the outer peripheral position of the unit case connecting portion of the center duct. For this reason, two left and right side ducts each having insertion-side elastic ribs 7 and 8 can be elastically fixed to one center duct having receiving-side ribs 9 and 10 by rib insertion operation. That is, when fixing the left and right two side ducts near the unit case 3, it is not necessary to perform operations such as screwing, and the cost can be reduced.

  As mentioned above, although the air-conditioning duct fixing structure for vehicles of this invention has been demonstrated based on Example 1, it is not restricted to this Example 1 about a concrete structure, It concerns on each claim of a claim Design changes and additions are allowed without departing from the scope of the invention.

  In Example 1, the example of the uneven shape which has a rib side press part, a duct side press part, and an elastic bending part was shown as an insertion side elastic rib. However, the specific structure of the insertion-side elastic rib is not limited to the stepped shape shown in the first embodiment, and is inserted in the receiving-side rib with elastic deformation so as to expand the opposing surface of the receiving-side rib. Various deformed shape examples may be used as long as the restoring elastic force is applied.

  In Example 1, the example in which the opposing surface of the receiving side rib is configured by the rib inner surface and the duct wall surface is shown. However, for example, the shape of the receiving rib may be a U shape, and the opposing surfaces of the receiving rib may be rib inner surfaces facing each other.

  In the first embodiment, the application example in which the left side differential duct 4 and the right side differential duct 5 are fixed to the center differential duct 6 is shown. For example, the left side vent duct and the right side vent duct are fixed to the center vent duct. It may be an example to do. In short, the present invention can be applied as a duct fixing structure for a vehicle air-conditioning unit in which two or more ducts are arranged so as to intersect or be adjacent to each other.

It is a whole perspective view which shows the internal layout of the instrument panel to which the air-conditioning duct fixing structure for vehicles of Example 1 was applied. FIG. 2 is a view in the direction of arrow C in FIG. 1 illustrating a fixing structure of both side differential ducts with respect to a center differential duct in the vehicle air-conditioning duct fixing structure according to the first embodiment. The left insertion side elastic rib and the left receiving side rib in the vehicle air-conditioning duct fixing structure of Example 1 are shown, (a) shows a plan view of the left insertion side elastic rib, and (b) shows the left insertion side elastic rib. FIG. 1C is a view in the direction of the arrow C in FIG. 1 of the rib, and FIG. The right insertion side elastic rib and the right receiving side rib in the vehicle air-conditioning duct fixing structure of Example 1 are shown, (a) shows the C insertion arrow view of the right insertion side elastic rib in FIG. 1, (b) Shows a view in the direction of arrow C in FIG. 1 of the right receiving side rib. It is an effect explanation perspective view showing the insertion fixing operation by the insertion side rib and the receiving side rib in the conventional duct fixing structure. It is effect | action explanatory drawing which shows the insertion fixing state by the insertion side rib and receiving side rib in the conventional duct fixing structure. The insertion fixing action using the insertion side elastic rib and the receiving side rib in the air conditioning duct fixing structure for the vehicle of Example 1 is shown, (a) is an exploded perspective view of the insertion action of the insertion side elastic rib with respect to the receiving side rib. (B) shows the taper guide action at the E portion for ensuring the insertion workability. It is action | operation explanatory drawing which shows the insertion fixation state using an elastic restoring force by the insertion side elastic rib and the receiving side rib in the air-conditioning duct fixing structure for vehicles of Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument panel 2 Air conditioning unit 3 Unit case 4 Left side differential duct (equivalent to a 1st duct and a left side duct)
5 Right side differential duct (equivalent to 1st duct and right side duct)
6 Center differential duct (equivalent to 2nd duct and center duct)
6a Wall 7 Left insertion side elastic rib (insertion side elastic rib)
71 rib side pressing part 71a pressing surface 72 duct side pressing part 72a pressing surface 73 elastic deflection part 74 taper guide part 8 right insertion side elastic rib (insertion side elastic rib)
81 rib side pressing part 81a pressing surface 82 duct side pressing part 82a pressing surface 83 elastic bending part 84 taper guide part 9 left receiving side rib (receiving side rib)
9a Inner surface 91 Reinforcement rib 10 Right receiving side rib (receiving side rib)
10a Inner surface 101 Reinforcement rib part a Insertion side dimension b Receiving side dimension

Claims (5)

A first air outlet and a second air outlet that are opened in the unit case of the air conditioning unit, a first duct that is connected to the first air outlet and has an insertion-side rib, and is connected to the second air outlet, A second duct having side ribs,
In the vehicle air-conditioning duct fixing structure in which the first duct is fixed to the second duct by inserting the insertion-side rib into the receiving-side rib,
The insertion-side rib is inserted into the receiving-side rib with elastic deformation so that a restoring elastic force acting in a direction of expanding the opposing surface of the receiving-side rib is a fixing force for fixing the first duct. plug-side elastic ribs der that is,
The insertion-side elastic rib has a stepped shape formed by a square-shaped protruding piece protruding from the first duct, and a pressing surface of a rib-side pressing portion that presses against an inner surface of the receiving-side rib, and the receiving-side rib A pressing surface of a duct-side pressing portion that presses against a wall surface of the second duct facing to each other, and an elastic bending portion formed at a connection portion between the rib-side pressing portion and the duct-side pressing portion,
The receiving-side rib has an inner surface that is in pressure contact with a pressing surface of a rib-side pressing portion of the insertion-side elastic rib, and a reinforcing rib portion that protrudes from the outer surface of the rib, and the insertion is performed by the reinforcing rib portion. even if insertion side elastic rib deformation amount is suppressed, the inner surface of the receiving-side rib for a vehicle air-conditioning duct fixed structure, characterized in that it is configured on the wall and parallel surface of the second duct. In the vehicle air-conditioning duct fixing structure according to claim 1 ,
The separation of the pressing surface of the pressing surface and the duct side pressing portion of the rib-side pressing portion before inserting the front Symbol insertion side elastic rib and insertion side dimensions, wall surface of the the inner surface of the receiving-side ribs second duct The vehicle air-conditioning duct fixing structure according to claim 1, wherein the insertion-side dimension of the insertion-side elastic rib is set to be larger than the receiving-side dimension of the receiving-side rib. In the vehicle air-conditioning duct fixing structure according to claim 2,
The insertion-side dimension of the insertion-side elastic rib and the reception-side dimension of the receiving-side rib are different from each other even if there is a maximum variation that is assumed when the first duct and the second duct are manufactured or assembled. The vehicle air-conditioning duct fixing structure is characterized in that the insertion side dimension is set to be larger than the receiving side dimension. In the vehicle air-conditioning duct fixing structure according to any one of claims 1 to 3,
A vehicle air-conditioning duct fixing characterized in that at least one of the insertion-side elastic rib and the receiving-side rib has a taper guide portion having a tapered shape that gradually decreases in thickness in the insertion direction. Construction. The vehicle air conditioning duct fixing structure according to any one of claims 1 to 4,
The first duct is a left side duct extending leftward from the setting position of the unit case, and a right side duct extending rightward from the setting position of the unit case,
The insertion-side elastic rib is integrally formed with the left insertion-side elastic rib integrally molded at the outer peripheral position of the unit case connecting portion of the left side duct and the outer peripheral position of the unit case connecting portion of the right side duct. Resin molded right insertion side elastic rib,
The second duct is a center duct extending in the vehicle front-rear direction from the setting position of the unit case,
The air-conditioning duct fixing structure for a vehicle, wherein the receiving-side ribs are a right receiving-side rib and a left receiving-side rib which are integrally molded with an outer peripheral position of a unit case connecting portion of the center duct.

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